Research of Meso-mechanical Performances of Recycled Brick Concrete

Abstract

Based on PYTHON, a mesoscale model of multi-interface recycled brick concrete was constructed by ABAQUS. The concrete consists of seven-phase inhomogeneous composites, including waste brick, waste concrete, old and new mortar, waste brick-new mortar, aggregate-old mortar, and new-old mortar. The numerical model was established by considering different aggregate placement rates and brick amounts, with a coarse aggregate placement rate of 45%. Computational analysis of the fine-scale mechanical properties was completed, and the damage mode of the recycled concrete containing bricks under the load was investigated. The study showed that the peak stress and elastic modulus of recycled brick concrete decreased gradually with an increase in brick quantity, and the peak strain of recycled brick concrete increased with an increase in brick quantity. However, the damage pattern of concrete with different brick quantities was basically the same.